The edges of
the visor can be left as is, or pick up and knit 2 stitches for every 3 rows
across the top, then bind off. Repeat across the bottom. Another option is to
crochet the edge.

Weave in any
loose ends. Attach the visor by stitching through the buttons to hold it in
place. Stitch on the blade, leaving enough room at the front of the head so the
visor can sit between the front band and end of the blade. Block the hat over a
balloon or other round object.